Back-spacer for type-writers.



W. R; FOX.

BACK SPACER FOR TYPE WRITERS,

. APPLICATION FILED DEC-14.1907. RENEWED JAN. 18,1912.

L1 @3, 1 i Patented Dec. 7, 191 5.

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Application filer": fieccinher 3.4;, 3437, Emriel Ho. cos ice.

To all whom it may concern Be it known that I, WiLLIAM R. Fox, e citizen of the United. tates, residing at Grand Rapids, in the county of -Kent, dtnte of Michigan, have invented certain new and useful Improvements in Back-Spacers for Type-Viriters, of which the following iso specification.

This invention relates to improvements in back-spacers for typewriting machines."

The objects of the invention ore to pro vide a, simple and very effective means of book-spacing, which can be readily applied to or removed from a typewiliting machine.

A further object is to provide an effective stop means for limiting the heck throw of the beck-spacer.

Objects pertaining to details of construction will definitely appeal from the detailed description. to follow.

accomplish the objects of my invention by the devices and means described and illustrated in the following specification.

The invention is clearly defined endpoint-- ed out in the claims.

The features of my invention are fully illustrated in the ccconnpanying; drawing, forming o pert of this specification, which:

Figure 1 is a rear view of the top portion of a typewriter and its escnpcnient mechanism with my improved back-spacer in PlitCG; Fig. 2 is a plan View oi the etsnctnre appearing in Fig. l, the top plote oi the typewriter and the connection to the backspzicer being} shown in broken. sections; Fig.-

3 is a sectional view taken on line of Fig. 1, showing the details of construction at this point; Fig. i is a similar detail sec tionnl View till-Ion on line l lofiFig. 1;

and Fig. 5 is a. similar detail sectional View,

taken on line of Fig. 1, showing the relation of the cscspcnicnt dogs to the teeth of thecsccpeinent-Whecl. o

In the drawing. the sectional views are taken looking in the direction of the little arrows at the ends of the section lines, and similar letteis of reference refer to siinilcr parts throughout the several views. V

Referring to the numbered parts of the drawing, poftionsof the topples-e 1 of a typewriteitore illustrated; s position of the rock: 2, ivhich is connected to the carriage," is also illnstrsted; and the cscepement-wheel 3, with its pinion d for engaging the rack, are also shown in their proper position, as

- Specification of? Letters JPstc-nt.

Patented Hes. *3, iitlllt.

Jennsxy 18, 1912. ficriellto. 671,887.

' they are carried by suitable brackets 01 supports on the top-plate oithe typewriting nniehine.

The dog-block 5 is supported on the rockshcft 6 which is pivoted above the top of the machine. The dogs are made adjustable hysuiteble mechanism actuated from the lever 7, which mechanism, as it has nothing. especially to do with this invention, wilLnot he fui'thei" described, it merely being illustrated to show a usual construction of such parts. "A bracket 8 is secured to the topplroie l and extends upwardly and is curved over the top of the rock-shaft 6, and the upper part of the bracket is re-curved at 8 to serve as a guide. A pin-stop 8" is inserted in this bracket. The back-spacer push-bar 9 fits into the guide 8 and is held normally etincted by the coiled spring 9 which connects the rear port of the same to any convenient portion of the machine. This pushbsr is connected to the belLcra-nk lever 10 which is pivoted at 11 on the top-plaiw'of the machine; A-push-rod 12 extends through the front-plate of the machine through a suitable guiding hole therein, and is provided with a push-button 13 for controlling the some. l he i ront end. ofthe push-bar 9 is provided with e notched catch 9" on its upper surface end is beveled on the linden.

side. The catch is positioned to engage one effect vely stops the some. course the escnpement Wheel is returned one notch, the esccpeinent dogs yield, as is usual in such constructions, and the carriage is efiectively back-set.

The virtues of this structure are itsexti'en'ie simplicity andefiecciveness and its of the escepement wheel,

ios

entire independence from othei parts of the machine then that which are concerned in the operation of the device.

Having thus described my invention, What i claim nsnew and desire to secure by Let- Patent. is:

1. In a typewriting machine, the combination witha wheehescapement of abracket on the top-plate having a suitable guide thereon and a stop-pin; a push-hararranged in the guide of said bracket, tangentially to said wheel, and having a notched catch for engagingone of the teethof the escapeinent-wheel, and beveled on its underside to contact with the said stop; a bell-crank lever fulcrumed on the top-plate of the type writer and connected to the said push-bar; a spiral spring connected to hold the said push-bar normally retracted; and a pushrod connected to said bell-crank lever and extending through the front-plate of the machine and provided with suitable pushbutton for controlling the said back-spacer, all co-acting substantially as described and. for the .purpose specified.

2. In a typewriting machine, the combination with a wheel-escapement of a bracket on the top-plate having a suitable guide thereon and a'stop-pin; a push-bar arranged in the guide of said bracket, tangentially to said wheel, and having a notched catch for 25 engaging one of the teeth of the escapementwheel: and beveled on its underside to contact with the said stop; a bell-crank lever fulcrum'ed on the top-plate of the typewriter and connected to the said push-:ar; a spiral spring connected to hold the said push-bar normally retracted; and connections to the front of the machine for actuating the said push-bar, for the purpose specified. i

In witness whereof, I have hereunto set my hand and seal in the presence of two witnesses.

WILLIAM R. FOX. [1,. s.] Witnesses ELLA DE Vines, ELvA FOSTER. 

